Problem with nRF51 antenna orientation

[Sami]

Hi,

I have problem with nRF51 antenna orientation. I used nRF51 developement kit (mKIT) board and I had problem with communication if I just change a little inorientation of board, this boards using PCB antenna. Now, I am using Laird module based on nRF51 and it used chip antenna but still I have the same problem. Please let me know what should I do about it and why it happen. Regards

[Asbjørn]

What do you mean by problems with communication? Are you not getting packages through or are you seeing that you are dropping a package every now and then? Do you have the wifi module running? Do you see the same issue if you turn the wifi part off?

As Nguyen said, what happens if you move the modules further apart from each other? Do you still see the same issue?

[Sami]

Dear Asbjorn,

Actually, I mean that if I change the orientation of one of the boards, the communication quality has a huge change, from loosing more than 50% of package up to loosing all of them and stop communication, certainly I have to use wifi module to transfer the packages over the air, I can not test it if I turn the wifi part off because there is no package transfer.

[Nguyen Hoan Hoang]

It is the BLE or the Wifi the problem? You are going to need to find out which one is losing signal then.

[Sami]

It is Wifi communication, and they communicate like pingpong, if one of them can not receive the packet master side retry sending old packet and it seems that one side or both can not receive packet.

[Asbjørn]

In some directions there will be reduced performance since the metal cap over the chip will block some direction, but it sounds very strange that it should kill the communication all together. Can you turn off the wifi part of this system and just send some simple packages from the nRF51822 to the other side of the link without the wifi running? I don't understand what you mean by there will be no packet transfer if the wifi is off on the module?